I have read this DTIC report:
Technical Report ARAEW-TR-05004
ENHANCED PROPELLANT AND ALTERNATIVE CARTRIDGE CASE DESIGNS
The subject of the report is: “The use of global enhanced propellants in the Global Manufacturing Solutions/Knox Engineering Company (KEC) high efficiency cartridge results in a 75% reduction in barrel heating, permitting the design of a significantly lighter barrel capable of sustaining the current firing schedule.”
Does anybody know this KEC high efficiency cartridge?
This is a photo from the report, comparing the KEC round with a standard 5.56 x 45.